So you did read the rules and now you are wanting to know in which group you should be in?
Anything is open so please do not be afriad and try something out that is either new or something you are use too!
Besides the groups is there actual races on this site. I will explain them to you so it is easier for you to expand and have fun.
Humans.
Eternals.
Nekoes.
Kitsunes.
Vampires.
Werewolves.
Inus.
Hybrids.
Elves.
Rabbit People.
Crusniks.
Mages/ Witches.
Andriods.
All of these are allowed on this site. If you desire to make another race up yourself then it is allowed just as long as you do not go over board with it.
Due to death are these opened. However, you must die first to be one of them!
Angels.
Demons.
Shinigami.
Though it does not say in the group there is a chance for you to be part of a Mafia or own one. All that you need to do is be Wealthy as well as explain it in your character sheet!